Insect screen for sash window



Oct. 7. 1969 A. F. AGNEw INSECT SCREEN FDR SASH WINDOW Filed June 1. 1967 United States Patent O 3,470,934 INSECT SCREEN FOR SASH WINDW Arthur Francis Agnew, Castle Cove, New South Wales,

Australia, assignor to Clearview Aluminium Windows Pty. Limited, Chatswood, near Sydney, New South Wales, Australia, a corporation of Australia Filed June 1, 1967, Ser. No. 642,944 Int. Cl. E06b 9/52, 3/44 U.S. Cl. 160--27 1 Claim ABSTRACT F THE DISCLOSURE This invention relates to perforated screens for windows, and more particularly to so-called insect screens which have line perforations and are adapted to be installed upon sash windows so that when such windows are opened, or partially opened, they permit the passage of air, but not insects.

It is a problem, when providing sash windows with insect screens, to locate the screens in such a manner that they may be manipulated with ease irrespective of the position of one or more sashes comprising said window, and it is an object of this invention to provide a screened window system wherein the screen may be moved into its operative positon with respect to the aperture of an opened or partially opened window by the same manipulation which positions the sash with respect to the jamb of said window.

According to the invention in one of its aspects, therefore, a sash window screen is adapted to be used in the open position or in any partly open position of the sash, without extending across any part of the window aperture remaining unopened.

According to the invention in another of its aspects, a flexible screen, wound upon a roller in the stowed position of said screen, is adapted to be fastened near its outer or free edge to the lower portion of the lower sash of a window, said roller being located within a hollow sill of said window, and said screen being adapted to extend by unrolling against spring resistance from said roller as said lower sash is raised with respect to said jamb, and to be restored to the stowed position upon said roller as said lower sash is lowered with respect to said jamb.

One particular embodiment of the invention will now be described with reference to the accompanying drawings, in which similar references indicate corresponding parts, and in which FIG. l shows in front elevation, a screen in its stowed position and also attached to a window sash in its closed position; FIG. 2 shows, in side elevation, a section along the line 2 2 of FIG. l; and FIG. 3 shows the arrangement of FIG. 2 wherein the sash is partly raised and hence the screen extends across the resulting window aperture.

Upon referring to the drawings, it will be seen that preferably, the sill 1 is provided whti an upwardly facing slot 2 through which the screen 3 may be drawn, and if desired, a lip arrangement (not shown) may be provided along the boundaries of the slot 2 so that a resilient seal 3,470,934 Patented Oct. 7, 1969 ICC is formed between the slot and the screen, to prevent foreign matter from falling down into the hollow sill 1.

lPreferably also, fastening means such as 4 are provided on both the outer or free edge 5 of the screen and also on or near the lower edge 6 of the lower sash 7 so that the screen may be detached from said sash in winter weather when few insects may be present. After detachment from the lower sash 7, the screen 3 may be permitted to withdraw into the sill 1 owing to the action of a restoring spring within the roller 8 until suitable stop means, which may, for example, consist of the free edge 5 engages the sill, thereby preventing said screen from falling wholly within the sill, and permitting its ready reattachment to the lower sash as required.

It will be understood that in a preferred form of the invention, it is desirable that the restoring spring associated with the screen roller 8 should be suficiently strong to pull the screen 3 down into its stowed position (as shown in FIGS. 1 and 2) as required, but should not be so strong that it prevents the sash 7 from being pushed upwards and immobilised in any one of its normal rest positions in which the window is opened to the desired extent, and wherein the aperture of said window is covered by the extended portion of the screen, as shown in FIG. 3.

It will be seen that in an arrangement constructed in accordance with the invention, it is merely necessary to perform one simple manual action |when opening ya sash window, said action not only opening the widow, but simultaneously screening the aperture in said window without further manipulation.

I claim:

1. In a window construction including a frame having a sill portion provided with an upwardly opening slot for passage therethrough of a flexible screen, a generally planar sash slidably disposed in the frame, a flexible screen carying roller rotatably secured and concealed within a compartment formed within the sill portion of the frame, and biasing means connected to the roller for producing the rotation thereof in response to a predetermined reduction in tension applied to the screen, the improvement comprising a sash extension projecting from the generally planar sash and being aligned in overlying and substantially parallel relationship with the uppermost surface of the sill portion of the window frame, means on the sash extension for removably connecting a free edge portion thereto, a free edge portion removably connected to the sash extension connecting means, the free edge portion being formed as generally rectangular channel member having a first surface removably connected to the sash extension and being disposed in parallel relationship with respect to the sash extension and the uppermost sill surface when connected to and disconnected from the sash extension, the first surface of the free edge portion being formed to overlie the exposed uppermost surface of the sill to cover and seal the slot of the sill when the sash is in closed position with respect thereto, the free edge portion being formed with a generally vertically depending connector leg extending the width thereof and disposed in parallel alignment with the slot in the sill for introduction therein when the sash is closed with respect to the sill, the flexible screen being secured to the connector leg and being movable with the leg and the sash, a channel closure leg being formed on each of the lateral extremities of the iirst free edge surface and depending therefrom in parallel relationship to the connector leg, the channel closure legs serving to enclose the lateral edges of the sill when the free edge portion is disconnected from the sash extension and when the sash is closed lwith respect to the sill.

3 4 References Cited DAVID I. WILLIAMOWSKY, Primary Examiner UNITED STATES PATENTS J. KARL BELL, Assistant Examiner 474,122 5/1892 Godfrey 160-100 1,138,668 5/1915 Knapp 160-27 U S, C1- X.R 2,079,718 5/1937 Sgritta 160-27 5 FOREIGN PATENTS 916,668 1/1963 Great Britain. 

